adventurer vs diver

adventurer and diver both are nouns.

Word	Noun	Adjective	Verb	Adverb
adventurer	Yes	No	No	No
diver	Yes	No	No	No

As nouns, diver is a hyponym of adventurer; that is, diver is a word with a more specific, narrower meaning than adventurer:

adventurer: someone who travels into little known regions (especially for some scientific purpose)
diver: someone who works underwater

adventurer (noun)	diver (noun)
a person who enjoys taking risks	large somewhat primitive fish-eating diving bird of the Northern Hemisphere having webbed feet placed far back; related to the grebes
someone who travels into little known regions (especially for some scientific purpose)	someone who dives (into water)
	someone who works underwater